Motorcycle swing arm



FIG. 1 is a right, rear perspective view of a motorcycle swing arm showing my new design;

FIG. 2 is a left, rear perspective view thereof;

FIG. 3 is a right side elevational view thereof; and,

FIG. 4 is a left side view thereof.

The broken line showings of the circle in FIGS. 1 and 3, and the hardware in FIGS. 2 and 4 are for illustrative purposes only and form no part of the claimed invention. 

The ornamental design for a motorcycle swing arm, as shown and described. 